gqualls:

[url=http://www.hareline.com/threadstinsels.html:74c00]Hareline[/url:74c00] is a distributor so possibly a Hareline dealer can order it for you. The XX only comes in gold & silver.

It's tough stuff to find in the XX size as I found out last year. I got mine from Hook & Hackle in Canada but the link I had is no good any more. The "USA" Hook & Hackle doesn't list it on their website. Possibly another Canadian supplier may have it. It is readily available from UK on-line retailers.

BTW, if you get offered substitutes; here is the measurements I came up with:
  • *Ultra Wire Size Small - .007
    *Ultra Wire Size Ex Small - .005
    *Lagartun Size X Small - .0025
    *Lagartun Size XX Small - .002
Good luck in your search and let us/me know where you found it for future reference.